Needle drainage of subretinal fluid. A randomized clinical trial.

Needle drainage of subretinal fluid with simultaneous observation using the indirect ophthalmoscope has been reported to have a very low complication rate. The technique was evaluated by a prospective clinical trial. The study group consisted of 100 patients undergoing scleral buckling for rhegmatogenous retinal detachment who were randomly assigned to groups treated with needle drainage or conventional two-stage drainage. At 1 month, the retina was anatomically flat in 88% of all cases. Subretinal hemorrhage occurred in 10 of 45 patients (22.2%) after needle drainage and in 7 of 55 patients (12.7%) after conventional drainage. The difference was not statistically significant. Retinal puncture occurred during conventional drainage in one case and in no cases during needle drainage. There were no cases of retinal incarceration. The results showed that subretinal hemorrhage was more common after needle drainage, but a larger study would be required to show whether this difference was statistically significant. The fear that the retina would be damaged by placement of a needle in the subretinal space throughout the drainage procedure was unfounded.